[Elecraft] Sub RX Filters choice

[mm0gpz]

Fred/Mike/Gary.

Thanks for useful replies.

Other than the 2.7 Khz, the 2100 and 400 are both 8 pole filters so no
offset required, hopefully.

Thanks for the tip re inserting any further filters in main RX prior to
installing sub RX.

I was considering a filter for RTTY contesting in the main RX and I
intended to purchase a second 400 Khz filter for 2nd RX if it is required
for diversity reception?

Gary. I had just been looking at all the filter curves and trying to
ascertain if the the 200 filter is actually narrower than the 250. It is
shown on a different graph scale that makes it difficult to determine? It
certainly looks narrower at the peak but I'm not sure the skirts are as
tight? If the 200 is wide enough for RTTY (170 shift), then I suppose that
is an option if it is in fact usefully narrower than the 250?  I am
considering when I am trying to run on RTTY and being squeezed out, would
the 200 or 250 filter be useful in that scenario?

I had also just been reading about your 700 Hz filter and wonded why is was
so popular. I will do a bit more reading on that now.

73

Gordon
MM0GPZ